# Math Help - cant get to the same expression as the solution..

1. ## cant get to the same expression as the solution..

i tried to solve it by myself but
in my expression as you see i get a totally different expression when i do coefficient of exponent then the one in the solution
did i do it correctly
$[CR_1+C\alpha \beta R_2]\frac{-\beta }{\tau }e^\frac{-t }{\tau }+Be^\frac{-t }{\tau }=V_0e^\frac{-t }{\tau }$

the alpha and beta dissapeared
why?

2. I'm afraid I can't make heads or tails out of this. How is $V_c^p$ related to $V_C$? And why does one have $e^{\frac{t}{x}}$ while the other has $e^{\frac{t}{\tau}}$? If that is not a typo, where did "x" come from?

3. ok thats the formal solution

look at my expression
if i do the coefficients equation of the exponent then i will get the correct expression
for B?